this code below will crash after running around 5 minutes. caused by high cpu usage and memory usage.
[NSTimer scheduledTimerWithTimeInterval:0.1 repeats:YES block:^(NSTimer * _Nonnull timer) { if (@available(iOS 10.0, *)) { UIImpactFeedbackGenerator *feedBackGenertor = [[UIImpactFeedbackGenerator alloc] initWithStyle:UIImpactFeedbackStyleMedium]; [feedBackGenertor impactOccurred]; } }];
